Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a55aaec205ccf1…

MALICIOUS

PDF

106.1 KB Created: 2021-03-04 16:27:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: b0b22b7c4e3b028ce0740eaf71d34f5b SHA-1: 2fa04bcf55e8d1f0bcc4c3f5bb0bf4d1e9a379a5 SHA-256: f5a55aaec205ccf1cbe62f9ff7fabf91c875097125f89c6b47a7b76ec46b0e0e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded content, though heavily obfuscated, appears to be a lure related to cinematography search terms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seumenha.ru/award?keyword=what+are+the+different+aspects+of+cinematography PDF link annotation
    • https://lelodudovoveju.weebly.com/uploads/1/3/1/6/131607117/6781470.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421624/normal_5fcc6c865e423.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469631/normal_5fe2ab4521a5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417314/normal_603544a7911b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380210/normal_600d2dd5c0681.pdfIn PDF document text
    • https://femodamokej.weebly.com/uploads/1/3/4/5/134529999/1aa08fdf7.pdfIn PDF document text
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/8485d92fe.pdfIn PDF document text
    • https://cdn.sqhk.co/konafomaz/hajhggf/business_plan_template_powerpoint_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403266/normal_5fd0b768482ef.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/PMjbjff/all_about_history_book_of_ancient_rome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418783/normal_5fd2c40b1cdd2.pdfIn PDF document text
    • https://cdn.sqhk.co/gojapawareke/hihij3r/7073809343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411511/normal_6021995cbaba8.pdfIn PDF document text
    • https://lokudepapina.weebly.com/uploads/1/3/5/3/135325929/poluzawegaware.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423752/normal_60254573ee7cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403820/normal_601368209dd2c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed10418e-8f37-4c5f-b0aa-a07682d9b7b0/homelite_240_chainsaw_chain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14419420-a53d-4371-8b78-cfcc9385118c/jelijeritajowufosovurelu.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/dikoruwatefisuxipawaki.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/56469037650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/946e0b84-2b0e-43cd-9df4-44f047b3deba/sivevugelejagozixul.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/30278699533.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001657c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1657C 5652 bytes
SHA-256: faff13305260ac3581abfc418ca95fdd90964f7e690f437f37fbf6cc67a3ccbd
font_01_sfnt_off000178a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178A7 11960 bytes
SHA-256: 97b84a3347ec3ced1d3255417fc1c5847514aa42485946efde6d453413e998e3